Mohammed Noor Masri is one of the Australians who joined IS, although he denies killing anyone. In April he admitted his "mistake" in joining the terrorist group but begged to be brought home to face justice in Australia.

His mother, who asked to remain anonymous, has hit out at the Australian government for ignoring the "dire situation" facing the prisoners and their families.

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"The Australian government has had six months now to get those people out of there, and they've been sitting on their hands ... it's too late now," she said.

"It's a complete fiasco."

Mohammed Noor Masri's mother holds a photo of her son taken in 2002. Credit:Louise Kennerley

Defence Minister Linda Reynolds said on Tuesday the government "will not jeopardise the lives of any other Australians" in response to Mr Trump's sudden decision to withdraw troops from parts of Syria now home to Australian women and children left behind by IS.

As the US pulls out and Turkish forces move in, Mr Masri's mother fears that "it's going to be a bloodbath".

"The Kurds have been stabbed in the back by the US," she said.

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Mr Masri's mother said she had written letters to senior government figures including Foreign Affairs Minister Marise Payne and Home Affairs Minister Peter Dutton to lobby for her son, daughter-in-law and grandchildren. She has yet to receive a reply.

"I phoned up [Greens leader Richard] Di Natale and he’s the only one who got back to me. He said he’ll make representations to the government and said 'If they get back to me we’ll let you know'. I assume they haven’t heard," she said.

Fearful of what will happen next, all she can do is trawl the internet for updates to the crisis.

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"I don’t know what to think any more. We’re all sitting here biting our nails wondering what will happen. All we can do is sit and wait now."

Mr Masri's mother traces her son’s path to Syria back to "substantial behavioural problems" during a dysfunctional childhood in a broken home.

"He was headed for a life of crime. I could just see it unfolding before [my eyes]. I had no authority in his life."

But she is adamant her son would not harm anyone.

"This boy," she said, pointing to a school photo of her son, "he's not a killer. He's a naughty boy, but he's not a killer."

She said the past six months had left her feeling "very alone, isolated, annoyed [and] frustrated". She only found out from the media in April that her son was in prison having gone to live with IS.

"I found out my daughter-in-law only weighs 39 kilograms. She has no breast milk and another woman is feeding her baby. If something happens to her, the baby dies. It’s a disgusting state of affairs."